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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳逸民(Yih-Min Wu) | |
| dc.contributor.author | Pei-Ying Wu | en |
| dc.contributor.author | 吳沛穎 | zh_TW |
| dc.date.accessioned | 2022-11-24T09:26:54Z | - |
| dc.date.available | 2022-11-24T09:26:54Z | - |
| dc.date.copyright | 2021-11-05 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-10-19 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/81760 | - |
| dc.description.abstract | 地殼中的地震規模頻率分布 (地震b值) 主要受到軸差應力所影響，兩者之間有負相關，孔隙水壓則被認為是影響b值變化的次要因素之一。部分研究者在注水實驗中發現孔隙水壓增加造成地震b值增加的現象，但其他研究團隊在不同地區觀察到b值隨孔隙水壓相反變化的案例，故本研究嘗試以統計方法驗證能否在非人為實驗下觀察到此相關性。由於孔隙水壓在地殼中的實際數值難以量測，基於Vp/Vs和孔隙水壓變化之間有正相關性且不受軸差應力變化影響特性，本研究以Vp/Vs作為地殼中孔隙水壓的指標與地震b值進行比較。本研究選擇日本作為研究地區，採用日本氣象廳地震目錄在1998年至2011年2月之間發生於距日本本島海岸線40公里內、規模大於0.0且深度小於30公里之地震事件，並使用時間域與空間域雙鍵結法去除地震群集。假設Poisson process進行參數驗證，所得出參數為在主震規模4.5下以4天5公里進行計算。在計算Mc及地震b值方法上使用最大曲率法及最大似然法，格點大小為0.1° × 0.1° × 10公里，只計算格點中心半徑30公里內包含150起以上地震事件的格點。速度構造模型則採用日本防災技術研究中心提供之2019年模型，以及Nakajima (2001) 和Yamamoto (2014) 的速度構造模型，並將VP/VS值以線性加權方式重新採樣至與地震b值相同格點上。將三個模型之Vp/Vs對完整地震目錄及去群集地震目錄所計算之地震b值做每十公里深度區間的線性迴歸分析，發現完整地震目錄資料點的b值較為分散，因此將每0.01Vp/Vs區間對b值計算分組平均及中位數，並以分組b值和Vp/Vs進行迴歸分析。在全日本尺度下b值和Vp/Vs相關性在各深度範圍中皆不顯著，故進一步以Itoigawa Shizuoka 斷層線將日本區分為東北及西南兩區域，觀察到b值和Vp/Vs在東北日本深度10到20公里處呈現正相關，西南日本的原始與去群集目錄結果則分別在10到20公里及0到10公里呈現負相關。前人研究顯示日本地殼中應力型態在空間分布上也有東北、西南的差異，在東北日本以逆斷層應力場為主，西南日本則以平移斷層應力場為主。本研究所得出之Vp/Vs多小於2.0，表示地殼內含水量較低，大尺度下無法觀察孔隙水壓對b值影響，故推論東北及西南日本b值和Vp/Vs相關性的正負差異可能源自於地殼應力場不同。 | zh_TW |
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| dc.description.tableofcontents | "誌謝 i 中文摘要 ii ABSTRACT iii 目錄 v 圖目錄 viii 表目錄 xi 第一章 緒論 1 1.1 研究動機 1 1.2 地震b值 3 1.3 Vp/Vs 4 1.4 日本地區地體構造 5 第二章 研究資料 7 2.1 地震資料來源、選取與地震觀測站歷史演進 7 2.2 Vp/Vs速度構造模型 11 2.2.1 NIED (2019) 速度構造模型 11 2.2.2 Nakajima (2001) 速度構造模型 12 2.2.3 Yamamoto (2014) 速度構造模型 12 第三章 研究方法 18 3.1 去地震群集 18 3.1.1 地震群集 18 3.1.2 時間域與空間域雙鍵結法 19 3.1.3 Poisson process理論檢驗去地震群集 20 3.2 計算Mc與地震b值 21 3.2.1 最大曲率法 (Maximum curvature method, MAXC) 21 3.2.2 最大似然法 22 3.3 Vp/Vs值重新取樣 23 3.4 迴歸分析 24 第四章 數據結果測試與比較 25 4.1 去除地震群集 25 4.1.1 測試21年結果 25 4.1.2 測試時空參數 26 4.2 Mc、地震b值與Vp/Vs值分布：原始地震資料 29 4.2.1 Mc參數測試 (R、n) 29 4.2.2 地震b值結果 34 4.3 Mc、地震b值分布：去地震群集資料 39 4.3.1 地震b值結果 39 4.4 Vp/Vs值重新取樣結果 44 4.5 Vp/Vs值與地震b值迴歸分析結果：原始地震資料 49 4.5.1 日本整體 49 4.5.2 分區結果 (東北、西南) 49 4.6 Vp/Vs與地震b值迴歸分析結果：去地震群集資料 54 4.6.1 日本整體 54 4.6.2 分區結果 (東北、西南) 54 4.7 Nakajima模型 (東北) 58 4.7.1 Vp/Vs重新取樣結果 58 4.7.2 Vp/Vs與地震b值迴歸分析結果 58 4.8 Yamamoto模型 (四國) 62 4.8.1 Vp/Vs重新取樣結果 62 4.8.2 Vp/Vs與地震b值迴歸分析結果 62 第五章 討論 66 5.1 不同區域及模型結果比較 66 5.1.1 去地震群集的影響 66 5.1.2 東北、西南日本各深度相關性差異 67 5.2 南加州相關案例比較與討論 69 第六章 結論 71 參考文獻 72 附錄 82" | |
| dc.language.iso | zh-TW | |
| dc.subject | 地震b值 | zh_TW |
| dc.subject | 地震規模頻率分布 | zh_TW |
| dc.subject | Vp/Vs | zh_TW |
| dc.subject | 日本 | zh_TW |
| dc.subject | Japan | en |
| dc.subject | Vp/Vs ratio | en |
| dc.subject | earthquake b value | en |
| dc.subject | earthquake-size distribution | en |
| dc.title | 地震規模頻率分布與Vp/Vs值在日本地區之相關性 | zh_TW |
| dc.title | Correlation between earthquake b value and Vp/Vs ratio in Japan | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 黃信樺(Hsin-Tsai Liu),詹忠翰(Chih-Yang Tseng),陳冠翔 | |
| dc.subject.keyword | 地震規模頻率分布,地震b值,Vp/Vs,日本, | zh_TW |
| dc.subject.keyword | earthquake-size distribution,earthquake b value,Vp/Vs ratio,Japan, | en |
| dc.relation.page | 85 | |
| dc.identifier.doi | 10.6342/NTU202103730 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2021-10-19 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 地質科學研究所 | zh_TW |
| 顯示於系所單位： | 地質科學系 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| U0001-1410202117532700.pdf 未授權公開取用 | 9.6 MB | Adobe PDF |
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